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NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Analyzing +4 | -1

The correct order of decreasing second ionisation energy of

Li,\,Be,\,Ne,\,C,\,B

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Correct option: D

Li > Ne > \,B > \,C > \,Be

Option B (

Li > Ne > B > C > Be

) is correct because after the first ionization, Li attains a noble gas configuration, requiring significantly more energy for the second ionization. Ne loses a p electron, B loses an s electron, C loses an s electron, and Be loses an s electron.

More Questions from CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The elements with zero electron affinity are S-I:

\mathrm{Cu}^{+2}

paramagnetic.

S-II: All the orbitals present in

\mathrm{Cu}^{+2}

ion are doubly occupied. Which of the following is the most electropositive element? The law of Octaves is not applicable to: Assertion (A): Mendeleev's arranged elements in horizontal rows and vertical columns.
Reason (R): Mendeleev's ignored the order of atomic weight thinking that the atomic measurements might be incorrect. Which of the following electronic configuration does not belong to same block as others?